It is possible to have a custom domain name. Please read this tutorial for more information: Have a custom Domain

However, once your domain name has been bought or offered through ForuMotion, it is not possible to transfer the Domain Name to another registar.Domains purchased via Forumotion are dedicated only to Forumotion forums.

Moreover, transfering domain name causes many problems like:

It may creates duplicate content, which cancel your referencing. Loss of the SEO also

Loss of redirection on the base URL of your forum

Loss of Custom email boxes

By consequences,ForuMotion has decided to stop the process. If you want to transfer your domain name to another registar, you have to wait until the end of the domain will expire (one year from purchase date).